import pygame
import time
import random

pygame.init()

# 定义颜色
WHITE = (255, 255, 255)
YELLOW = (255, 255, 102)
BLACK = (0, 0, 0)
RED = (213, 50, 80)
GREEN = (0, 255, 0)
BLUE = (50, 153, 213)

# 调小游戏窗口尺寸
dis_width = 600
dis_height = 400
dis = pygame.display.set_mode((dis_width, dis_height))
pygame.display.set_caption('贪吃蛇游戏')

clock = pygame.time.Clock()

snake_block = 10
snake_speed = 15

# 更换为 macOS 系统自带中文字体
font_style = pygame.font.SysFont("Hiragino Sans GB", 25)
score_font = pygame.font.SysFont("Hiragino Sans GB", 35)


def Your_score(score):
    value = score_font.render("你的分数: " + str(score), True, YELLOW)
    dis.blit(value, [0, 0])


def our_snake(snake_block, snake_list):
    for x in snake_list:
        pygame.draw.rect(dis, BLACK, [x[0], x[1], snake_block, snake_block])


def message(msg, color):
    mesg = font_style.render(msg, True, color)
    dis.blit(mesg, [dis_width / 6, dis_height / 3])


def gameLoop():
    game_over = False
    game_close = False
    paused = False  # 新增暂停标志

    x1 = dis_width / 2
    y1 = dis_height / 2

    x1_change = 0
    y1_change = 0

    snake_List = []
    Length_of_snake = 1

    foodx = round(random.randrange(0, dis_width - snake_block) / 10.0) * 10.0
    foody = round(random.randrange(0, dis_height - snake_block) / 10.0) * 10.0

    while not game_over:

        while game_close == True:
            dis.fill(BLUE)
            message("你输了！按 Q-退出 或 C-重新开始", RED)
            Your_score(Length_of_snake - 1)
            pygame.display.update()

            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_over = True
                        game_close = False
                    if event.key == pygame.K_c:
                        gameLoop()

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_SPACE:  # 处理空格键事件
                    paused = not paused
                    if paused:
                        message("游戏暂停，按空格继续", YELLOW)
                        pygame.display.update()
                if not paused:  # 非暂停状态下处理移动
                    if event.key == pygame.K_LEFT or event.key == pygame.K_a:
                        x1_change = -snake_block
                        y1_change = 0
                    elif event.key == pygame.K_RIGHT or event.key == pygame.K_d:
                        x1_change = snake_block
                        y1_change = 0
                    elif event.key == pygame.K_UP or event.key == pygame.K_w:
                        y1_change = -snake_block
                        x1_change = 0
                    elif event.key == pygame.K_DOWN or event.key == pygame.K_s:
                        y1_change = snake_block
                        x1_change = 0

        if not paused:  # 非暂停状态下更新游戏逻辑
            # 处理边界穿越
            x1 = (x1 + x1_change) % dis_width
            y1 = (y1 + y1_change) % dis_height

            dis.fill(BLUE)
            pygame.draw.rect(dis, GREEN, [foodx, foody, snake_block, snake_block])
            snake_Head = []
            snake_Head.append(x1)
            snake_Head.append(y1)
            snake_List.append(snake_Head)
            if len(snake_List) > Length_of_snake:
                del snake_List[0]

            for x in snake_List[:-1]:
                if x == snake_Head:
                    game_close = True

            our_snake(snake_block, snake_List)
            Your_score(Length_of_snake - 1)

            pygame.display.update()

            if x1 == foodx and y1 == foody:
                foodx = round(random.randrange(0, dis_width - snake_block) / 10.0) * 10.0
                foody = round(random.randrange(0, dis_height - snake_block) / 10.0) * 10.0
                Length_of_snake += 1

        clock.tick(snake_speed if not paused else 1)  # 暂停时降低帧率

    pygame.quit()
    quit()


gameLoop()